Having problems with your Pentax *ist D Digital Camera ?
Program mode I have a question about the program mode. there are 4 choices according to the manual: 1. Normal, 2-High-peed priority, 3-Depth-of-field priority, 4-MTF priority.
I know I am going to feel stupid, but what is MTF priority?
I wasn't any good at acronyms in the service either.
MTF = Modular Transfer Function. MTF tests is a chart describing the lens performance (sharpness, contrast etc.) throughout the aperture range. All lenses has a "sweet spot", where the best performance is given. But this can vary, not just from lens type to lens type - but also sample to sample (due to manufacturing tolerances). Each sample of modern Pentax lenses (FA, and to my knowledge also DA) are MTF tested - and the aperture which gives the best performance is coded in the MTF chip and read by cameras supporting MTF program. MTF program line simply tries to set this optimum aperture, or coming as close as the light conditions allow.
MTF stands for "Modulation Transfer Function" ... It's a somewhat arcane name for one type of testing methodology used in modern lens analysis. \015\012\015\012The *ist D's MTF priority program mode sets the "best" aperture to use for a given ISO setting and meter reading based upon lens information encoded in the latest FA series lenses. Earlier series lenses do not include MTF information in their communication with the camera so I suspect it defaults to Normal program mode when non-FA lenses are used.
Repair Help & Product Troubleshooting for Pentax *ist D Digital Camera
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Program mode I have a question about the program mode. there are 4 choices according to the manual: 1. Normal, 2-High-peed priority, 3-Depth-of-field priority, 4-MTF priority. I know I am going to feel stupid, but what is MTF priority? I wasn't any good at acronyms in the service either.
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